TM 9-2320-364-20-2 2-1190 6.  WORK LIGHT(S) WILL NOT OPERATE (CONT). 2. Replace work light lamp (Para 7-55). Verify repair, go to Step 14 of this Fault. YES NO Headlights operate, indicating   12 vdc input to circuit breaker   CB4. Work light lamp faulty. Work light internal power wire   faulty. Work light internal switch faulty. Work light internal ground wire   faulty. Wire 1435 at work light harness   connector faulty. Circuit breaker CB4 faulty. Wire 1040 faulty. Wire 1040A faulty. Wire 1435 between relay R4   and ground faulty. Relay R4 faulty. Wire 1292 faulty. Work light switch faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Continuity test. STE/ICE-R #91. If lamp filament faulty, lamp will not light. WARNING 3. Repair internal power wire 1040B (see schematic Fig 2-27) or notify DS Maintenance. Verify repair, go to Step 14 of this Fault. YES NO Headlights operate, indicating   12 vdc input to circuit breaker   CB4. Work light lamp OK. Work light internal power wire   faulty. Work light internal switch faulty. Work light internal ground wire   faulty. Wire 1435 at work light harness   connector faulty. Circuit breaker CB4 faulty. Wire 1040 faulty. Wire 1040A faulty. Wire 1435 between relay R4   and faulty. Relay R4 faulty. Wire 1292 faulty. Work light switch faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Continuity test. STE/ICE-R #91. If continuity is not measured, work light internal power wire is faulty and work light will not operate. WARNING Is continuity measured across work light lamp? Is continuity measured from terminal A of faulty work light connector to internal power wire 1040B at wire nut? Read   WARNING on Page 2-1191 Read   WARNING on Page 2-1191